Bomb-proofing VISA serial interface

[bhimsen]

Hi

I am running labview 11.0.1f2 (32 bit) on a windows 7 PC, talking to a KMtronic USB relay device.I have problems when I am trying to communicate with Labview.

I have attached a snapshot of the program and the error.

Grateful if you could help. Thanks.

Bhimsen

[GerdW]

Hi bhimsen,

- which COM-Port are you trying to use?

- does your hardware even provide a COM port?

[MarkDavidGeorgePotter]

I don't have my development machine available today but will chack against my code as soon as I am able. Can you post a picture of the front panel so we can see the final string been written and COM port?

Thanks,

Mark.

P.S. GerdW, a functional KMtronic relay does provide a COM port (it runs a USB-Serial adaptor then the relay accepts instructions written to the "virtual" serial port)

[bhimsen]

I have posted the picture of the front panel.The relay board does have USB port. I have tested it with its driver, it's working perfectly.

It is working in Labview in the single run mode. However, it is showing the error while on the 'run continuously' mode.

Thanks for your help.

Bhimsen

[GerdW]

Hi bhimsen,

never use "Run Continuously" except for debugging purposes!

- Use a while loop when you need your VI to run for some (unknown) period of time!

- Don't initialize the port in each iteration!

- Don't close the port in each iteration!

- Use some decent wait instead of banging the hardware as fast as you can!

- Go through some LabVIEW basics!

- Look at the supplied example VIs! I recommend "Advanced serial read and write" example VI...

[bhimsen]

Thanks for your advice. I'll try and let you know.

Bhimsen

[bhimsen]

Hi

It's working now.

Thank you for your help.

Bhimsen